A Hierarchy of Families of Recursively Enumerable Degrees

@article{Welch1984AHO,
  title={A Hierarchy of Families of Recursively Enumerable Degrees},
  author={Lawrence V. Welch},
  journal={J. Symb. Log.},
  year={1984},
  volume={49},
  pages={1160-1170}
}

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